Grab yourself a Specialized Hardrock if you can for the following reasons:
1. It’s actually a good frame, you can hang some really good kit off it later and it still won’t let you down. Punches well above it’s price tag!
2. They’re virtually indestructible! I’ve had mine for nearly 3 hard years doing virtually everything and it just brushes it off!
3. Providing you buy the one with disc brakes they’re relatively cheap to upgrade later. The cable discs are actually pretty good and have same power as the hydraulics you can upgrade to. The headsets and BBs last quite a while as well. The ISIS BB lasted a good two years before conking out (ISIS BBs normally have a life you can measure with a stopwatch)
Downside:
The fork. Most are specced with Suntours, and even the top end model only has a Rockshox Dart. However with a price tag like that new I’d be surprised if they didn’t come with Suntours. However, someone on here will probably be able to flog you a much better fork for £100-150 (we’re talking Rockshox Pikes, Revelations, etc.) which will be night-and-day compared to any fork you can get in your budget.